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How do the electron configurations of chromium and copper contradict the Aufbau principle?

April 26, 2017aufbau Chromium configurations contradict Copper electron Principle

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How do the electron configurations of chromium and copper contradict the Aufbau principle?

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The Aufbau principle meaning “building up, construction” is used to determine the electron configuration of an atom, molecule or ion. chromium need 1 electron from the 4s subshell to half fill the 3d orbitals, and copper also need 1 electron from the 4s to to fill completly its 3d subshell.

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The Aufbau principle meaning “building up, construction” is used to determine the electron configuration of an atom, molecule or ion.
chromium need 1 electron from the 4s subshell to half fill the 3d orbitals, and copper also need 1 electron from the 4s to to fill completly its 3d subshell.